package com.zsxb.crm.interceptor;

import com.zsxb.crm.constant.LoginConstant;
import com.zsxb.crm.context.BaseContext;
import com.zsxb.crm.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = "no_token";
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if ("Admin-Token".equals(cookie.getName())) {
                    token = cookie.getValue();
                    break;
                }
            }
        }
        //2、校验令牌
        try {
            log.debug("jwt校验:{}", token);
            Claims claims = JwtUtils.parseToken(token);
            //Long empId = Long.valueOf(claims.get(LoginConstant.USER_ID).toString());
            String username = claims.get(LoginConstant.USERNAME).toString();
            log.info("当前员工：{}", username);
            //存入线程局部变量
            BaseContext.setCurrentId(username);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            log.debug("jwt校验失败：{}", ex.getMessage());
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //用完之后，移除线程局部变量
        BaseContext.removeCurrentId();
    }
}
